what goes over hill and vale.make a noise,but never leaves a trail?谜底是什么?

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what goes over hill and vale.make a noise,but never leaves a trail?谜底是什么?
what goes over hill and vale.make a noise,but never leaves a trail?谜底是什么?

what goes over hill and vale.make a noise,but never leaves a trail?谜底是什么?
wind;
green新手
in pink 状态很好
white elephant 无用的东西
as black as coal 极黑